研究了不同种类早强剂、减水剂等功能外加剂对铬铁渣基复合材料性能的影响。通过单因素实验考察了不同掺量的 NaCl (NC)、Na2 SO4(NS)、NaF (NF)和Al2(SO4)3(AS)等4种无机早强剂对铬铁渣基复合材料性能的影响,利用正交试验考察4种早强剂与木钙(CL)减水剂的复配对复合材料性能及结构的影响,得出复合型外加剂的最佳方案及组成,即 NC为0．6％,NF 为0．6％,NS 为1．2％,AS 为0．7％,CL为0．25％。采用 XRD 和 SEM 等测试方法分析复合材料水化产物物相组成和微观形貌。研究表明,复合型外加剂加速并促进了铬铁渣基复合材料水化进程,降低孔隙率,提高复合材料的密实度。复合型外加剂具有减水和早强叠加效应,改善流动性的同时提高复合材料的强度,其3,28 d 抗压强度可达37．44和66．29 MPa,分别提高了46．6％和18．4％。将无机早强剂与减水剂进行复合设计,既能发挥无机早强剂的良好早强效果,又能弥补早强剂后期强度的不足。
In this paper,the influence of fast-setting/early-strength agents and water-reducing agent on the prop-erties of ferrochromium slag based composite materials.The effects of the amount of early-strength agents such as NaCl(NC),Na2 SO4 (NS),NaF(NF)and Al2 (SO4 )3 (AS)was studied respectively by single-factor experi-ment.And the optimal composition of compound admixture was obtained by orthogonal experimental,which are NC:0.6%,NF:0.6%,NS:1.2%,AS:0.7%,CL:0.25%.The phase composition and morphology of fer-rochrome slag based composite materials were characterized by means of XRD and SEM.It was showed that the hydration process of composite materials was accelerated and the porosity was reduced after adding the com-pound admixtures.So the compound admixtures had double effects to reduce the water demand and increase the early strength.The compressive strength at 3 and 28 d could reach 37.44 and 66.29 MPa,and increased by 46.6%,18.4%.The inorganic early-strength agents and the water-reducing agent were meanwhile used in the system of ferrochromium slag based composite materials,not only played a role for the high-early strength,but also made up for the deficiency of latter stage strength of early strength agent.
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